[Qemu-devel] [RFC 28/47] pc: acpi-build: generate pvpanic device description dynamically

[Igor Mammedov <imammedo@redhat.com>]

Drops AML template patching and allows to
save some space in SSDT if pvpanic device doesn't
exist by not including disabled device description
into SSDT. It also makes device description
smaller by replacing _STA method with named value
and dropping _INI method.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/i386/acpi-build.c  | 36 ++++++++++++++++++++++++++++++++----
 hw/i386/ssdt-misc.dsl | 47 -----------------------------------------------
 2 files changed, 32 insertions(+), 51 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 48a72ad..b1495b6 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -754,7 +754,7 @@ build_ssdt(GArray *table_data, GArray *linker,
     int ssdt_start = table_data->len;
     AcpiAml table_aml = { .buf = table_data };
     uint8_t *ssdt_ptr;
-    AcpiAml pkg, scope;
+    AcpiAml pkg, scope, dev, method, crs, field;
     int i;
 
     /* The current AML generator can cover the APIC ID range [0..255],
@@ -769,9 +769,6 @@ build_ssdt(GArray *table_data, GArray *linker,
     patch_pci_windows(pci, ssdt_ptr, sizeof(ssdp_misc_aml));
 
     ACPI_BUILD_SET_LE(ssdt_ptr, sizeof(ssdp_misc_aml),
-                      ssdt_isa_pest[0], 16, misc->pvpanic_port);
-
-    ACPI_BUILD_SET_LE(ssdt_ptr, sizeof(ssdp_misc_aml),
                       ssdt_mctrl_nr_slots[0], 32, nr_mem);
 
     /*  create S3_ / S4_ / S5_ packages if necessary */
@@ -802,6 +799,37 @@ build_ssdt(GArray *table_data, GArray *linker,
     aml_append(&scope, acpi_name_decl("_S5", pkg));
     aml_append(&table_aml, scope);
 
+    if (misc->pvpanic_port) {
+        scope = acpi_scope("\\_SB.PCI0.ISA");
+
+        dev = acpi_device("PEVR");
+        aml_append(&dev, acpi_name_decl("_HID", acpi_string("QEMU0002")));
+
+        crs = acpi_resource_template();
+        aml_append(&crs,
+            acpi_io(acpi_decode16, misc->pvpanic_port, misc->pvpanic_port, 1, 1)
+        );
+        aml_append(&dev, acpi_name_decl("_CRS", crs));
+
+        aml_append(&dev, acpi_operation_region("PEOR", acpi_system_io,
+                                               misc->pvpanic_port, 1));
+        field = acpi_field("PEOR", acpi_byte_acc);
+        aml_append(&field, acpi_named_field("PEPT", 8));
+        aml_append(&dev, field);
+
+        method = acpi_method("RDPT", 0);
+        aml_append(&method, acpi_store(acpi_name("PEPT"), acpi_local0()));
+        aml_append(&method, acpi_return(acpi_local0()));
+        aml_append(&dev, method);
+
+        method = acpi_method("WRPT", 1);
+        aml_append(&method, acpi_store(acpi_arg0(), acpi_name("PEPT")));
+        aml_append(&dev, method);
+
+        aml_append(&scope, dev);
+        aml_append(&table_aml, scope);
+    }
+
     {
         AcpiAml sb_scope = acpi_scope("_SB");
 
diff --git a/hw/i386/ssdt-misc.dsl b/hw/i386/ssdt-misc.dsl
index 26b9241..81be858 100644
--- a/hw/i386/ssdt-misc.dsl
+++ b/hw/i386/ssdt-misc.dsl
@@ -39,51 +39,4 @@ DefinitionBlock ("ssdt-misc.aml", "SSDT", 0x01, "BXPC", "BXSSDTSUSP", 0x1)
        ACPI_EXTRACT_NAME_DWORD_CONST ssdt_mctrl_nr_slots
        Name(MEMORY_SLOTS_NUMBER, 0x12345678)
     }
-
-
-    External(\_SB.PCI0, DeviceObj)
-    External(\_SB.PCI0.ISA, DeviceObj)
-
-    Scope(\_SB.PCI0.ISA) {
-        Device(PEVT) {
-            Name(_HID, "QEMU0001")
-            /* PEST will be patched to be Zero if no such device */
-            ACPI_EXTRACT_NAME_WORD_CONST ssdt_isa_pest
-            Name(PEST, 0xFFFF)
-            OperationRegion(PEOR, SystemIO, PEST, 0x01)
-            Field(PEOR, ByteAcc, NoLock, Preserve) {
-                PEPT,   8,
-            }
-
-            Method(_STA, 0, NotSerialized) {
-                Store(PEST, Local0)
-                If (LEqual(Local0, Zero)) {
-                    Return (0x00)
-                } Else {
-                    Return (0x0F)
-                }
-            }
-
-            Method(RDPT, 0, NotSerialized) {
-                Store(PEPT, Local0)
-                Return (Local0)
-            }
-
-            Method(WRPT, 1, NotSerialized) {
-                Store(Arg0, PEPT)
-            }
-
-            Name(_CRS, ResourceTemplate() {
-                IO(Decode16, 0x00, 0x00, 0x01, 0x01, IO)
-            })
-
-            CreateWordField(_CRS, IO._MIN, IOMN)
-            CreateWordField(_CRS, IO._MAX, IOMX)
-
-            Method(_INI, 0, NotSerialized) {
-                Store(PEST, IOMN)
-                Store(PEST, IOMX)
-            }
-        }
-    }
 }
-- 
1.8.3.1